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Analysis of the condition of the K 220-44 steam turbine drainage pipeline and proposal of corrective measures
Horký, Jiljí ; Milčák, Pavel (referee) ; Šnajdárek, Ladislav (advisor)
This diploma thesis deals with the analysis of the drainage pipeline of the Škoda K 220-44 steam turbine. This turbine is operated in Dukovany Nuclear Power Plant. One part of this work is proposal of corrective measures. The aims of this work include the creation of a search for drainage, steam, erosion corrosion and mapping of defects in long-term operated drainage system. Work also includes the evaluation of measured values of the pipe wall thickness measured by ultrasonic analyzer. In addition, the work contains images created from 3D model, on which the location of defects and measurements are displayed.
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Matematical model of permeability evolution in a fractured porous media due to internal erosion and deposition.
Krajinová, Markéta ; Lanzendörfer, Martin (advisor) ; Zumr, David (referee)
The seepage of fluid through saturated porous media may lead to inner erosion, channelization, preferential flow and transport and deposition of particles. A novel mathematical model was created to describe some of the processes. The model describes a temporal and spatial development of porosity (volume fraction) and permeability (transmissivity) due to erosion and deposition in saturated porous and fractured media. The model calculates the change of permeability and porosity in a direction of different fracture joint sets. The model is based on multi-continua theory, where a region is divided into components (three or more components in this thesis). The components are described by separate differential equations. This approach was used recently by Mahadevan et al. (2012) and Fujisawa et al. (2009) for erosion of porous media. This thesis describes the approaches, assumptions and the equations used in the model. In contrast to the published models, the thesis considers anisotropy. It is characterized by transmissivity tensor (also hydraulic conductivity tensor), which is composed of vectors in the joint sets directions. The model also uses a Dupuit approximation, which allows to approximate flow onto a horizontal plane. The model is also introduced by a numerical simulation using final element...
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Heating and cooling systems in a multifunctional building
Fuksa, Lukáš ; Horák, Petr (referee) ; Formánek, Marian (advisor)
The master´s thesis is about the design of heating and cooling of a multifunctional house. The building is functionally divided into parts of shops, administration and apartments. Thesis describes various cooling options and basic types and functions of air conditioning systems. Three variants of the system at the level for expanded building permits and their evaluation are developed. The selected variant is developed at the project level for the construction.
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Manual versus orbital GTAW piping welding
Hofbauer, Jan ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
In thesis are compared options of stainless steel piping welding, orbital and manual version of method GTAW and GMAW. At the beginning, these methods are described theoretically and after that there are described materials used for fabrication two test welds on austenitic steel piping of diameter 168 mm. The first weld was made by orbital method GTAW, the second one by manual method GMAW. Next, these two welds are compared based on defects, welding parameters and width of heat affected area. The conclusion is that both welds are defect-free and because of economical aspects is better to use orbital GMAW method for this diameter of piping.
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Types and principles of water reservoirs
Cakl, Vojtěch ; Fialová, Simona (referee) ; Pochylý, František (advisor)
The bachelor thesis deals with decription of the water reservoirs, in particular for the purposes of the irrigation. In the first part of the thesis is overview of the functions and distribution by purpose and location to the consumption. Following is the proposal of the storage tank volume by purpose. In next part there is a description of the construction, shape and equipment of the water reservoir. Subsenquently there is expalained the principle on simple arithmetical example. The last part of the bachelor thesis focussing of multifunctional water reservoirs and their functions in relation to the landscape. It contains some examples and proper scheme of multifunctional water reservoir.
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Cooling systems for polyfunctional object.
Milatová, Adriána ; Blasinski, Petr (referee) ; Formánek, Marian (advisor)
The diploma thesis deals with the design of cooling devices of a fourteen-storey polyfunctional building with administration part and housing units. The thesis describes the physical nature of cooling, the basic types and functions of cooling systems and legislation related to cooling devices. Two types of cooling systems are selected and developed for the assigned object at the building permit design level. The work includes calculations of all elements of individual systems. The purpose of this diploma thesis is the comparison of these variants and the evaluation of suitability for use on the individual parts of the assigned building. The variant chosen is elaborated at the level of the rea-lization project, including the drawing documentation.
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Elements reducing pressure in pipeline systems
Kohút, Jiří ; Kůrečka, Jan (referee) ; Himr, Daniel (advisor)
The aim of the bachelor thesis is to provide a comprehensive overview of control elements in piping systems. The fluid at different flow rates exhibits different behavior and due to the fluid contact with the pipeline, pressure losses occur. Elements in piping systems meet various requirements such as pressure control, flow rate control, barrier and flow direction control. The thesis deals with the categories description and functional priciples of individual elements. The practical part consists of the laboratory measurement describing characteristic of one of the pressure control elements, namely the pressure reducing valve. The measured characteristic is compared to characterstic from a company called Malgorani.
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Air-Conditioning in the hospital pavilion
Kops, Tomáš ; Blasinski, Petr (referee) ; Rubinová, Olga (advisor)
The aim of the bachelor thesis is to design and evaluate the air-conditioning system for the medical facility. The first and second above-ground floors are designed and designed to meet hygienic and operational conditions for medical facilities. The air-handling system provides fresh air into the interior, eliminating heat losses in the winter and heat gains in the summer.
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Heating of cultural house with restaurant
Ratajský, Radek ; Vyhlídalová, Karolína (referee) ; Počinková, Marcela (advisor)
The topic of this thesis is the design of heating, mechanical ventilation and hot water production in a culture center with a restaurant – Sokolovna. The thesis is divided into three parts – theoretical, calculations and the project. The theoretical part is focused on solid fuel boilers and the related legislation. The heat transmission calculations, the design of heat source, heating elements, hot water production and distribution can be found in the calculations. The project contains drawings and the technical report.
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Channels eroded by groundwater flow in Strelec quarry: erosion processes and factors influencing channel evolution
Soukup, Jan ; Bruthans, Jiří (advisor) ; Grmela, Arnošt (referee)
Large depression cone in water table was formed due to mining in surroundings of Střeleč quarry. The concentrated inflow from conduits to quarry is up to 70 l/s. Large conduit systems are created by flowing water into the quarry. The biggest conduit system was at least 300 m long and 17 m high with maximum calculated volume of 22 thousands m3 . Evolution of these conduits usually takes several months to few years. Fast conduit evolution allows to study erosion processes in detail in situ. In the thesis I am describing conduits, character of flow and erosion processes. Measured flow velocities in conduits are up to 0,4 m/s with hydraulic gradient 1 to 5%. Flow velocities and hydraulic gradients are typical for piping erosion. Piping initially forms small protoconduits. The bigger conduits are formed as water is progressively drained from larger area. Conduits are following fracture surfaces, which are also limiting the conduit propagation to the sides. Above water table the conduits are enlarged mainly by mass wasting of undercut sandstone slabs. For distinguishing less and more erodible parts of sandstone, we adapted and partially developed a method for measuring erodability (REI) and drilling resistance (DR). Both are used to compare different types of sandstone surfaces. In lowermost part of the...
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